Improvement in stone and ore crushers



UNITED` STATES PATENT @Errea ANTHONY POLLOK, OF WASHINGTON, DISTRICT OFCOLUMBIA, ADMINIS- TRATOR OF HENRY ROWLAND MARSDEN, DEOEASED, ASSIGNORTOl GEORGE DALTON, OF LEEDS, ENGLAND.

IMPRQVEMENT'IN STONE AND ORE CRUSHERS.

Specification forming part of Letters Patent No. 1,871,414, datedFebruary 13, 1877; application tiled September 12, 1876.

To all whom it lmay concern `Be it known that HENRY BowLAND Maus- DEN,late of Leeds, in the county of York, England, deceased, did in hislife-time invent certain Improvements in Stone and Ore Crushers, ofwhich the following is a specifi? This invention relates to thatdescription of more nearly to that of a perfect cube than is :attainablewith the apparatus as heretoforei constructed; a further object oftheinvention is to facilitate the fitting of the jaws, and to dispense withthe white-metal joint ordinarily l required.

In carrying out the invention, in order to obtain these objects, theapparatus is con- -structed and arranged in the following manner,reference being had to the several liigures yon the accompanyingdrawings, which representa machine consisting of a stationary jaw and amovable jaw.

The sam-e letters indicate like parts in all the figures.

Figure l of the accompanying drawing represents .a sectional elevationot' a complete machine having the improvements which form the subject ofthis invention applied thereto.

tw'o jaws. Fig. 3 represents a front elevation of the movable jaw 5 andFigs. 4, 5, and 6 rep resent, respectively, front and back elevationsand .sectional plan of the. stationary jaw.

A B is the removable working-face of the ,Fig. 2 represents a sectiontaken through the Y movable jaw, 'and O is the jaw-stock. D E is l theremovable working-face of the stationary v jaw, and F is the portionof.the frame into' which it is fitted.

According to one part of the invention, in

lieu of making the longitudinal line of the teeth straight or acontinuous contour from the top ofl the jaw-to the bottom thereof, anabrupt recession is made in the plane of the teeth, as shown at a a,Fig. 2, so that the longitudinal line of the portion of the toothedsurface which is above the point a-viz, from a to b-projects to someextent beyond the longitudinal line of the portion of the toothedsurface which is below the point a-videlicit, from a to c.

By means of this arrangement, the stone under operation, after it hasbeen first broken by the upper portions a b, on reaching the top ofthe-lower portion a c, is caused to roll kor turn .over by reason of thesudden change or recession in the plane of the face of the teeth,whereby the stones are reduced to ,an approximately perfect cuboidalform, in lieu of to a semi-elongated form, as is frequently the casewhen operated upon in the apparatus as previously constructed.

In the drawings, both the 'stationary jaw and the movable jaw are shownas constructed with the recession a; -but either of them may be lnadestraight, or of a continuous contour from the top b to the bottom c,the' other only being formed with the recession a.

The lines of the points ot' the teeth and of the intervening furrows arecontinued straight from the top b as far as the point a, only belowwhich point the teeth are diverted later- .allythat is to say, thepoints d d of the uppreferred to construct them ot' smaller pitch, l vas shown in the drawing.

The mode of arranging the teeth of the lower portion of the oppositejaws .may be varie-d; .but the arrangement in the example illustratedhas been found convenient and eicient in practice.

In this example, the teeth of the lower portion of the movable jaw arecontinued-uniform from the point a to the bottom c, with the eX- ceptionthat a transverse iiat surface is provided at a', while those of thelower portion of the stationary jaw are similar at the part-s e and c,but their points and furrows are a'gain diverted at the intermediateportion f. In the upper portions, moreover, the points of the teeth ofone jaw are arranged opposite the furrows of the other jaw, while at theextremity of the lower portions the points of the teeth of one jaw arearranged opposite the points of the teeth of the other jaw.

The working-faces of the jaws are made renewable, and they may also bemade reversible from top to bottom,and from back to front, S0 as toobtain four successive wearing-surfaces.

In the example shown in the drawings the removable working-faces aremade reversible from top to bottom only, in the following manner: Theworking-faces are constructed in two mainparts, as shown, A B beingthose of the movable, and D E those of the stationary jaw, the upperparts A and D, respectively, of which terminate at their lower ends atthe point of recession of the plane of the face of the teeth, so thateach part of 'either jaw may be reversed separately. The lips g h of thejaw-'stock C are slightly undercut, and a wedgepiece, G, is employed forsecuring the two parts A Bin position; by the act of tightening whichwedge-piece, by the aid of bolts and nuts the two parts are forcedoutward into, and` maintained in, their place, a tongue and recess at gh', Fig. 3, serving to prevent any lateral movement.

In fitting the working-face A B to the jawstock C, if the usualwhite-metal joint is not employed, it is requisite that the frontsurface of the jaw-stock and the back surface of the working-face A Bshould be planed true and smooth; but as it is also indispensable thatthe working-face'be made of a very hard material, it has hitherto beenfound impracticable to dispense with the joint'of-white metal.

' According .to this invention the required Objectis effected in thefollowing manner: A metal plate 4or mold is first prepared to the shapeof the counterpart of the jaw-face to be produced, and white iron (thatis to say the hardest mixture of metal practicable) in a moltencondition is then poured into a sufficient height to form the toothedportion of the face, after which the mold is filled with hematite orother suitable `iron in one continuousl to employ the arrangement shownin the draw- 1 ing. In this case the parts DE, which are cast of hardmetal, have wrought-iron or other suitable soft metal bars or stripsllcast at theirback by placing the bars in a mold and pouring in themetal around them, so as t0 form a surface suiciently soft to be capableof being planed. And as it is requisite -that the abutting surface ofthe frame should also be true and smooth, and it is found to be`inconvenient to plane the front surface of the frame itself, a softintervening cast-iron plate H is employed, which is planed to adapt itto the bars l l, and then inserted in the frame F, and retained by lipsor projections, the parts D E being maintained in position by means ofprojections and recesses at k, with which the plate H and the parts D Eare respectively provided, after which the whole is secured by wedges inthe usual manner. If desired, the working-face A B=of the movable jawmay be provided with wroughtiron bars or strips in lieu of its beingcast of metal of different degrees of hardness, as hereinbeforedescribed.

l Both methods of constructing the surfaces of the working-faces arealso applicable to breaking and reducing surfaces generally where asimilar object is desired to be attained.

I claim as the invention secured to me for improvements in machinery orapparatus for breaking or reducing stones and other hard and brittlesubstances- 1. A jaw Whose toothed face is constructed substantially asset forth, so that the plane of the faceiof the upper portion of thelength of such surface projects beyond the plane of the face of thelower portion of the length of such surface, and that the lines of thepoints and furrows of the teeth of the lower portion are divertedlaterally from the lines of the points and furrows of the teeth of theupper portion, substantially as and for the purposes hereinbeforedescribed.

2. A jaw in which theupper and lower portions of the toothed surfacehave their teeth of a different height and indi'erent vertical planesboth in the transverse line of the face of the teeth and at right anglesthereto, substantially as and for ,the purposes hereinbefore described.

3. The renewable working-faces of jaws, in which the teeth of the upperand lower portions are in different planes constructed in two or moreparts, and fitted and secured to the jaw stock or frame in such a manneras to lenable them lto be reversed or renewed separately when worn,substantiall'yas hereinbefore described.

L1:..The acting-faces or portions of the crushingjaws, vmadesubstantially as herein set forth-that is to say, adapted to beremovably fitted to, or contained within, a stock or frame, andconstructedA with their front and back faces cast of metal of dierentdegrees of hardness, as and for the purposes hereinbefore described.

5. A jaw having a. recession, substantially my name this 12th day ofSeptember, A. D.

veis herein shown and described. affording a 1876. Y

space for the stone or stones, after having been broken by the upperportion of the A' POLLOK toothed surfaces, to be turned and rolled overbefore being,` operated upon by t-he lower portion of the toothedsurfaces, as hereinbefore Witnesses:

described. HENRY R. ELLIOTT,

In testimony whereof I have hereunto signed EWELL A. DICK.

Marsden, deceased.

Administrator of the estate of Henry Rowland

